What is the effect of birthrate and deathrate in the size of population?
If the birthrate is higher than the deathrate the population size increases! If this carries on for large periods of time without check situations of overpopulation will occur, areas will become overcrowded, and “eventually” the land will not be able to support the ever-growing population. If the birthrate is lower than the deathrate the population size decreases! The population will get skewed to more older people and less younger people. It is the younger people that are required to do the work to support the older ones. If this situation carries on for too long future problems will result.